engelbrekt



G. ENGELBREKT.

COMPRESSOR MECHANISM.

APPLICATION man OCT. 4. i911.

Patented Oct. 21, 1919.

2 SHEETS-SHEET I.

G. ENGELBREKT. COMPRESSOR MECHANISM. APPLICATION FILED OCTJ, 1917. 1,319,213. Patented 0ct. 2l,1919.

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v awwzwlio c Qua-inf zzzyelbrakf v 1 fiT FE GEL R-EKT oifs m oa w sqeNsIa E QB me-elus ve Application filed October 4, 1917. Serial no. 194,773.

To all whom it may concern:

Be it knownthat' I, GUsTAr ENGELBREKT,

a citizen of the United States,-residing"at' Superior, in the county of Douglas and State of Wisconsin, have invented certain new and useful Improvements in Compressor Mech-. amsmg'of which the following is a spec1fica-- tion.

The invention has for an object to give a compressor'mechanism of an especially eificient characteryand' aims particularly to 'give a means for converting rotary motion to reciprocatory motion for the operation of pump pistons, 1n a manner to minimize the power requured for the operation of the pump. It is a further aim to give anyim provement in structural features of-such appliances tending to improve the functioning'of the appliance, and cheapening the manufacture and assemblage of the parts.

Additional objects, advantages and fea-' tures of invention will appear from the combination, arrangement and constructlon of parts, hereinafter described and shown in the drawings, whereinz" l Figure'l is a front elevational-view of a compressor device constructed in accordance with my invention.

Fig. 2 is a fragmentary elevation showing the cam levers and piston rods, as viewed from the left in Fig. l,with the bearing support and other interposed details broken power train including a four cylinder pum-p 'equ1pment, the cylinders and pistons ofwh1ch may be of anyfamiliar construction in which the intake is'through the upper end of the cylinder, the cylinders 10 in the present instance being shown east en bloc, and having an in tegral flange portion 11, resting upon the upper flanged part of a box-12*, having a Specificationof LettersPatent, PatentedOct. 21, 1919} having water co'olingconnections"l3 and 14 and provided with 'an air-cool1ng coil 15 in 7 its lower part from which connections are 1 having suitable guides and packing boxes-s 9 18 in Whichthe piston rods 19of=the pu=n1p 1' may reciprocate: These rod's areconnect'ed T by links 20' torespeotive levers Q lsupported upon a" shaft 22' carried bya frame 23 "of" suitable form? The levers Qll' 'are of-the firstvorder the shaft QQ-be'ing-the fulcrum, and

their ends opposite -the links are disposed.

between respective pairs ofcam disks 25, .gplined' upon a main shaft 26 having cranks 27 at'the endsdisposed' on*90- degree-radii: of theshaft. *Thedisks of "eac'h pair" are provided with opposed circular cam grooves or races 28,circumscribing the shaft26; be" mg located very closethereto at one side,

and close to the periphery o-f- 'the disks" at the opposlte side? 1 The; inner wall "29 of eachof these groovesis of plain: cylindrical form, and theouterwall 30 concentric there theadjacentface of the'disk in the'o'uterw in the grooves 'andieng'aged' revolulbly in the part of the groove. The inner end ofthe groove is 'planiform or otherwise formed" as- I found convenlent and desirable; Positioned adjacent endof each respective lever'21,- 1

there is a camwiper carriage 32, including' ,a centralenlarged wrist portion--83 en gaged in 'a'split floushing 34: adapted to Joe" presented inthe bifurcated-"end of the -'=lever*" 21 and secured by means of a"clamping"* bolt 35"engaged across the end'of thefurcations. Formed integrally with the wrist 33, atrespective sides there are-parallel bearing blocks 36, having a form: 0011- 3* forming to the curve of the grooves 28 and having groovedinner and outer-faces 37 and 38 respectively, opposed-to "the faces 29 and "30' of the camgrooves 28.

The grooves-in the faces of -the blocks 36 serve asrace-ways for disposed v 50 depth *greater--than that of the cylinders;

5 5 ing thempperends'of thec lindere 170, and

"75 with "also cylindrical in format its inne'r j partybu't provided witha ball race 81 near around the blocks 36. The dimensions of the blocks 36 between the faces 37 and 38 is such that when the balls at the outer side areinbearing upon the race 31 and grooved portion 38,- the'balls at the opposite side of the blocks are clear of the side 29 of the groove 28. Upon their outer side and closely adjacent the axis of the wrist 33, rollers 40 are mounted, having constant bearing upon the inner face 29 of the grooves 28, but with their axis so disposed and their diameter so proportioned that they do not engage the outer face 30 of the groove. In this way, a ball bearing is provided between the cam block and race 31 at the outer side, while a roller support is provided at the inner side. It is presumed that the compression stroke of the pump will be downward, so that during. the period of application of greatest force upon the levers 21, the block '36 will be supported over a large part of their length, and utilization made of the roller 40 and the smaller strength of its support for the return stroke of the piston of the pump. The wrist 33 is lo cated closer to one end of the blocks 36 than the other, and the longer ends of the blocks, beyond the wrist are disposed so as to extend upwardly in the grooves 28 in the direction of rotation of the cam disks. In this way, the balls will be carried upwardly at the outer side of the blocks 36, and permitted to return by action of gravity upon the opposite side of the blocks, the upper ends of the blocks being sloped as at 42 in such a manner as to facilitate their return movement, and small guide plates 43 and 44: are disposed outwardly of respective ends of the blocks, to guide the balls and retain them in proper operative relation to the blocks at their ends. These plates may be fastened upon the inner vertical faces of the blocks 36, and may have portions extended throughout the length of the blocks or as far as desirable, as indicated at 15, in Fig. 4.

While various constructions may be em ployed for the operation ofthe shaft 26, it is thought preferable to use an electric motor .46, mounted upon the frame 23, with intermediate connections now to be described. The motor shaft is provided with a small driving pinion 4E7, meshed with a large gear 48 splined upon a shaft 49 carried upon a suit-able extension of the frame 23, this shaft having a large crank 50 thereon connected by the link 51 to the long arm of a main lever 52 carried upon a small pedestal 53 on the lower part of the frame. This lever has a short arm 54 connected by a link 55 to one of the crank arms 27 of the shaft 26. The

shaft 49 is provided with a similar crank' at its opposite end from the crank 50, this detail not being illustrated, and similar connections aremadewith the crank 27 at the opposite end of the shaft 26.

The lever 52 is slotted intermediately of securing the boxing 56 against longitudinal movement in the lever, in the present in stance a set screw 59 being indicated.

By the multiplication of the pairs of disks 25 upon the shaft 26 and locating the cam centers on equally spaced radii as shown, an even appllcation of power is secured, so that the operation of the four pumps does not produce intermittent periods of resistance to;

the power tending to operate the device.

The power required for operating the device,

as will be readily understood by prior practree in this direction will be much less than where a crank shaft is used to operate the pumps, by reason of the fact that the point i of application of power by the cams during the period of maxlmum compression of air in the cylinders is of very short radius, re-

quiring only a small amount of power to' drive the mechanism, while on the outer part .I. a v 01 the movement of the. piston the wrists 33 being near the outer part of the disks, very rapld movement is attained and likewise only a small amount of power is required.

By means of the adjustable block in the lever 52, the ratio of power applied may be changed without modifying the gear connections, by shifting the boxing in the lever and changing the length of the crank arms at one end or the other and the link connections, as required. For this purpose any usual telescopic construction might be employed 1n the llnks and crank, in accordance with the usual practices in telescoping ma-: 1

chine elements.

Vhat is claimed is:

1. An appliance of the character described comprising a shaft, pairs of similar registered cams thereon, the centers of the pairs being located on equally spaced radii of the shaft, each cam having parallel inner and outer faces, one face having a ball race, a wiper device including blocks adapted to fit 1n respective opposed cams and having raceways therearound, balls therearound, a wrist carried therebetween adjacent one end, the

opposite ends of the blocks being extended upwardly in the cams and sloped for return of the balls from one side of a block to the other.

2. In a device of the character described,

a cam comprising opposed parallel circular elements each having parallel faces one having a ball race at its outer part, blocks curved to engage slidably in the respective elements, balls closely spaced around each block, means to retain the balls the blocks being of a dimension for bearing upon the balls at one side only, a roller on each block at the inner part of the cam and located. to bear upon the cam face opposite the raced face, a connecting element between the blocks at one end, the longer projecting ends being disposed upwardly in the cams'and sloped downwardly from one side to the other and a member to be operated, connected to said connecting element.

In testimony whereof I have aflixed my signature.

GUSTAF ENGELBREKT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

' Washington, D. 0. 

